As Mack and Tiffy prepare to leave the Unit the rest of the team travels to Pakistan to try to stop terrorists from unleashing a deadly smallpox epidemic.
Jonas' dad finally receives his Silver Star from the Korean War but the happy occasion is marred when Jonas makes a shocking discovery about his nephew.
Jonas is captured by Chechnyan rebels who want to arrange a prisoner exchange but American officials refuse to negotiate with a terrorist, and Charlotte gets Tiffy a lawyer.
Jonas and the team are assigned the task of unraveling an assassination plot involving high government officials at the same time as the women are being secretly relocated from the base for their own safety.
Jonas seeks revenge for the murder of his fallen colleague, Brown deals with a rescued journalist to be sure he doesn't betray them, and the team copes with Williams's death.
